Dell XPS/Dimension XPS - Manual (Page 18)

6. Lower the retention arm and press it into place, securing the card(s) in the computer.
7. Close the computer cover .
8. Connect the monitor cable to the card's video connector.
9. Connect your computer and devices to electrical outlets, and turn them on.
Drives
Overview
Your computer supports one floppy drive and a maximum combination of up to four of any of the following drives.
l Two hard drives (IDE, Serial ATA)
l Two CD or DVD drives
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
NOTE: Install only IDE hard drives or serial ATA hard drives in your computer. You cannot install both types of drives.